Machine for making taper tubes from hollow ingots



UNITED STATES l PATENT Onnrcn.

STEPHEN P. M. TASKER, OF PHILADELPHIA, PENNSYLVANIA.

MACHINE FOR MAKING TAPER TUBES` FROM HOLLOW INGOTS.

SPECIFICATION forming part of Letters Patent No. 513,218, dated January 23, 1894. Application tiled July 29, 1893. SerialNo. 481,848. (No model.)

. Manufacture of Tapering Tubes from Hollow ploy are,

Metal Ingots, of which ,the following is a specification.

The object of my invention is the manufacture of a tapering tube from a hollow, cylindriform, metal in'got, by rolling the said ingot, either hot or cold, by means of the apparatus hereinafter described, with the result of compactin g and consolidating the substance of the metal ingot into a tapering tube of therequired proportions. The ingots which I einas stated, of a hollow cylindrit'orm structure, and are open at both ends.

An apparatus embodying a good form of my invention is represented in the accompanying drawings, and described in this specification, the particular subject matter claimed as novel being hereinafter definitely described.

In the accompanying drawings, Figure lis a side elevation of an apparatus embodying my improvements. Fig. 2 is a top plan View of the same, partly sectional. Fig. 3 is a side elevational detail of the mandrel removed from the machine, and of two ofthe set of compressing rolls which act upon the ingot to eifect its initial compression; and Fig. 4 is an end elevational view, partially sectional, of one set of the finishing rolls.

Similar letters of reference indicate corresponding parts.

Before proceeding to describe my apparatus in detail, it is proper to say that I form the tapering tube by the employment, in connection with a prolonged tapering mandrel head encompassed by a series of sets of finishing rolls, as hereinafter particularly described, of an apparatus for manufacturing tubes from hollow metal ingots, in which a tapering mandrel is employed in connection with a set of exterior compressing rolls,--the set consisting of two, three, or more rolls,-arranged at an angle to each other, and each roll at a common angle to its neighbors and to the mandrel, conveniently an angle of about forty-tive degrees,upon which mandrel, or, rather, upon the cylindrical extension of the tapering portion of its head, the ingotis in the first instance placed, and from which the said ingot is forced vinto the grasp of the compressing rolls and by them consolidated and elongated into a tube.

In the operation of the aforesaid apparatus, the series of external compressing rolls is positively driven at a uniform speed and in the same direction, while the mandrel is held stationary against longitudinal movement but is rotated about its axis. After the working up of a given ingot, the mandrel is retracted from its position of encompassment by the compressing rolls, and in its retracted position is provided with another ingot before it is again advanced into its position for rolling. The apparatus referred to is, however, designed for the production of cylindrical or parallel walled tubes, and it is employed simply as an element of l my apparatus, the abruptly tapering portion of its mandrel head being prolonged to any desired degree to form a tapering extension possessing the form and length which it is desired that the tube to be produced shall possess; and, in conjunction with the said prolonged tapering extension of the mandrel head, I employ a series of sets of finishing rolls, each set consisting of a series of two, three, or more, concave-faced rolls arranged at an angle to each other, and each roll Vat a common angle to its neighbors, so that the concave-faced surfaces of all the rolls form a circular pass, encompassing the mandrel,the pass of each succeeding roll being, in consonance with the taper of the mandrel, proportionately smaller than the pass of the set last preceding, to the end that the finished tube may possess the desired tapering form.

Referring now to the apparatus represented in the drawings,A A represent two vertically erected, transversely extending, housing or frame plates, which are conveniently tied together by tie bars a a', and between which housings isA mounted a series of, in the construction represented, three, conical-faced rolls, B, B', B2, arranged at an angle to each other, and each roll at a common angle to its 4 boxings ax, formed or applied to the frame plates A A The inner extremities of the axles, or those projected from the basal portions of the rolls, are equipped with beveled pinions c c c2, of appropriate pitch to mesh with acommon beveled spur wheel C, mounted for rotary movement upon a tubular journal, and adapted to be actuated to `any desired rotation by any preferred contrivance, which I have not deemed it necessary to illustrate.

. Extending rearwardly from the housing A 'is a pair of longitudinal Ways D D', vertically aligned the one above the other, and connected at the rear by a standard d, the upper Way being at its front portion conveniently secured to the frame plate A by a bracket d', and the lower way being rigidly supported upon pedestals d2. These ways, which obviously may be connected and supported otherwise than as above, are simplya means for `supporting and permitting the longitudinal travel in` either direction of a mandrel-carrying frame, which I herein term the mandrel carrier E, and which is conveniently composed of two longitudinally extending parallel frame plates to which the letter E is directly applied, and which are adapted by being-suitably grooved or otherwise conformed to slide between the ways D D,and of two vertical connecting bars e, each of which is formed into or provided with a boxing e", the axes of the two boxings being lon-, gitudinally aligned. Through theseboxings therod` F of the mandrel F f, is journaled and` adapted. for rot-ary movement. At' its rear extremity the mandrelrod is provided with a spur wheel G engaged with a spur pinion g feathered upon a countershaft II adapted to be driven by a pulley h or by any other preferred means. The hub g of the spur pinion gis circumferentially grooved to cause the pinion, through the instrumentality of a forkedarm `g2 springing from the mandrel carrier and adapted to said groove, to slide longitudinally upon the countershaft in consonance with any longitudinal movement of the mandrel carrier and spur wheel G, without disengagement therefrom. By virtue of the foregoing contrivance, which is one of many that may be employed for the same purpose, the-mandrel is caused to revolve.

The longitudinal traverse of the mandrel for the application of the ingot, may be ac-` complished by many devices. I find it convenient to accomplish it by the following mechanisms-I is a longitudinally extending rack, connected with, or formed as a part of, the mandrel carrier, and adapted to be engaged with a rack pinion c', upon the extremity of a pinion shaft z'x, supported in suitable bearings i2, conveniently erected upon standards t3. This pinion shaft may be driven by a pulley i4, or otherwise as desired, and it is provided with a ratchet wheel i5 adapted to be engaged bya pawl 6, to maintain the frame iixedly in its position of ultimate advance. The mandrel head or mandrel proper, which is applied to or formed as a part of the rod at its advance end, and Vjust beyond the front end face of the forward boxing cx of the mandrel carrier, is composed of a cylindric body to which the letter F is applied, and of an abruptly conical head f, which bears such relation to the conical compressing rolls as to cause their surfaces to overlie its own in the manner represented in the drawings. J is a stripper, the same being a cylindric collar adapted to have longitudinal movement upon the cylindric body of `the mandrel for the purposeof stripping said body of theingot K originally placed thereupon, and forcing it into the grasp of the rolls. This stripper may j be operated in any preferred manner. I find it easy to remove it by a stripper lever j of any preferred form and connected with the stripperin any preferred manner.

` The apparatus hereinbefore described is not in itself claimed by` me. In connection with it, however, I employ `certain devices which as so employed are novel with me and which adapt theapparatus as a whole'to the manufacture of tapering tubes. These devices are the following: fx is a tapering extension of the mandrel head, the extent of the taper of which is slightand very much less` than the taper of the abruptly tapering portion f, with which, however, it merges by gradual curves. This tapering extension projects beyond the housing Ato a lengthV equal to the desired length of the nished IOC tube, and it is encompassed by a series of sets of finishing rolls, each of which sets consists, as already stated, of a series of three, although less or more than three might be employed, concave-faced rolls disposed each roll with its axis at an angle to that of every other roll, and all of the axes at a corresponding inclination. These finishing rolls I designate L, and they are suitably supported and journaled in any well known manner, in a frame M of any preferred construction. They are adapted to be positivelydriven, conveniently by the aid of beveled gearing. In the drawings, I have represented a series of five sets of these finishing rolls, but itis to be understood that the series may be composed il of less or more than five sets, the pass of each succeeding set being, of course, proportionately less than that of the set preceding. The speed at which the finishing rolls are driven is the same as that at which the compressing rolls are driven.

While I prefer to positively drive the mandrel, it is not essential tothe operation, and if the mandrel be left free to be rotated, it will be rotated by the friction exerted upon it by the ingot under the action of the compressing rolls.

It will `now be understood that in the `oper ation of the apparatus as an entirety, the ini tial compression and consolidation of the ingot are performed by the compressing rolls upon the abruptly tapering head f, of the mandrel, and that the extension and elongation of the compressed ingot into a tapering tube are performed by the nishing rolls acting in conjunction with said compressing rolls.

Having thus described my invention, I claim- I. In a machine for making tapering tubes from hollow metal ingots, the following elements in combination :-a rotatable mandrel having a cylindric body upon which the ingot is placed, an abruptly conical head formed as a continuation of said body, and a prolonged tapering extension formed as a continuation of said head,-a mandrel-carrying frame in which said mandrel is supported free for rotation,-a set of angularly disposed conical rolls encompassing the conical mandrel head, and disposed at an angle to each other and each roll at a common angle to its neighbors,a housing for supporting said set of rolls,-mechanism for driving said set of rolls,and a series of sets of concave-faced finishing rolls encompassing the tapering eX- tension of the mandrel,--substantially as set forth.

2. In a machine for making tapering tubes from hollow metal ingots, the following elements in combinatiom-a rotatable mandrel having a cylindric body upon which the ingot is placed, an abruptly conical head formed as a continuation of said body, and a prolonged tapering extension formed as a continuation of said head,-a mandrel-carrying frame in which said mandrel is supported free for rotation,-a set of angularly disposed conical rolls encompassing the conical mandrel head,' and disposed at an angle to each other, and each roll at a common angle to its neighbors,a housing for supporting saidset of rolls-#mechanism for driving said set of rolls,-means for positively rotating the mandreh-and a series of sets of conoave-faced finishing rolls encompassing the tapering extension of the mandrel,-substantially as set forth.

3. In a machine for making tapering tubes from hollow metal ingots, the lfollowing elements in combination z-ha rotatable mandrel having a cylindric body upon which the in got is placed, an abruptly conical head formed as a continuation of said body, and a prolonged tapering extension formed as a continuation ,of said head,a mandrel-carrying frame in which said mandrel is supported free for rotation,a set of angularly disposed conical rolls encompassing the conical mandrel head, and disposed at an angle to each other and each roll at a common angle to its neighbors,-a housing for supporting said set of rolls,-mechanism for driving said set of rolls,-means for positively rotating the mandrel,-means for positively advancing and retracting the'mandrel from its position of encompassment by the rolls,-and a series of sets of concave-faced finishing rolls encompassing the tapering extension of the mandreL-substantially as set forth.

4. In a machine for making tapering tubes from hollow metal ingots, the following elements in combination :-a rotatable mandrel having a cylindric body upon which the ingot is placed, an abruptly conical head formed as a continuation of said body, and a prolonged tapering extension formed as a continuation of said head,a mandrel-carrying f rame in which said mandrel is supported free for rotation,-a set of angularly disposed conical rolls encompassing the conical mandrel head, and disposed'at anV angle to each other and each roll at a common angle to its neighbors,-a housing for supporting said set of rolls,-mechanism for driving said rolls,- means for positively rotating the mandrel,- means for maintaining the mandrel iixedly in its advanced position within the rolls,- and a series of sets of concave-faced finishing rolls encompassing the tapering extension of lthe mandrel,-substantially as set forth.

5. In a machine for making tapering tubes from hollow metal ingots, the following elements in combination :-a rotatable mandrel having a cylindric body upon which the ingot is placed, an abruptly conical head formed as a continuation of said body, and a prolonged tapering extension formed as a continuation of said head,a mandrel-carrying frame in which the said mandrel is supported free for rotation,a set of angularly disposed conical rolls encompassing the conical mandrel head, and disposed at an angle to each other and each roll at a common angle to its neigh- IOO bors,-a housing for supporting said set of rolls,-mechanism for driving said rolls,- mechanism for forcing the ingot from off the cylindric body of the mandrel into the grasp of the rolls-and a series of sets of concavefaced finishing rolls encompassing the tapering extension of the mandrek-substantially as set forth.

In testimony that I claim the lforegoing as my invention I have hereunto signed my name this 22d day of July, A. D. 1893.

STEPHEN P. M. TASKER.

In presence of- F. NORMAN DIXON, JAMES LAUGHRAN. 

